摘要
利用改进的能够调整轮碾速度的车辙试验机,对AC20开展了30、45℃和60℃时不同轮压及轮碾速度下的车辙试验。试验结果表明,在45℃试验温度下,重载和低速的联合影响很容易使AC20的车辙指标值劣于60℃、标准轮压和标准轮碾速度条件下的结果;而在30℃试验温度下,即使有重载和低速的联合影响,AC20的车辙指标值仍然好于60℃、标准轮压和标准轮碾速度条件下的结果。分析结果说明寒冷地区沥青路面车辙的产生除因为沥青混合料高温稳定性不足外,还需要考虑中温时间段内重载和低速引起的变形。根据分析结果,建议寒冷地区沥青混合料车辙试验方法除需要将试验温度调整为45℃以外,同时还需要根据道路交通状况设定重载低速的试验条件。
Laboratory rutting tests for AC20 under the condition of different temperatures （30 ℃, 45 ℃ and 60 ℃ ）, wheel pressures and wheel running speeds were carried out with an improved wheel rutting tester whose wheel running speed can be adjusted. The test results show that （ 1 ） the rut index value of AC20 under the condition of 45 ℃, heavy loading and low speed can be inferior to that under the condition of 60 ℃, standard loading and standard speed; （2） it is difficult to induce rut for the AC20 at 30 ℃ even under the condition of heavy loading and low speed. The analytic result indicates that not only the rutting due to variable high temperature but also the rutting due to medium temperature combined with heavy loading and low speed should be considered to study the rutting deformation of asphalt pavements in cold area. Therefore, it is suggested to improve the laboratory rutting test method for cold area by introducing the testing condition of heavy loading and low speed besides changing the testing temperature from 60 ℃ to 45 ℃ according to the traffic condition.
出处
《公路交通科技》
CAS
CSCD
北大核心
2010年第11期38-42,共5页
Journal of Highway and Transportation Research and Development
基金
交通运输部西部交通建设科技项目(2009318000070
200731800003)
湖南省教育厅项目(06C109)
河北省交通运输厅科技项目(Y-2010138)
湖南省科技计划项目(2010GK3184)
关键词
道路工程
中温车辙
室内车辙试验
沥青混合料
重载
低速
road engineering
medium temperature rut
laboratory rutting test
bituminous mixture
heavy loading
low speed
